Filter



March 1949- c. F. HASSELWANDER 2,464,036

FILTER Filed Oct. 16, 1943 2 Sheets-Sheet l March 1 c. F. HASSELWANDER2,464,036

FILTER Filed Oct. 16, 1943 2 Shets-Sheet 2 1 N V EN TOR. 7 J cull/04'/-T M75554 w/r/voze Patented Mar. 8, 1949 FILTER Claude F. Hasselwander,Rochester, N. Y., as-

signor to Dollinger Corporation, a corporation of New York ApplicationOctober is, 1943, Serial No. 506,602

2 Claims.

. can be easily substituted for an element that has become fouled inuse.

Another feature of the invention relates to a novel arrangement forsealing the ends of the pockets or fins formed in a radial fin filterelement, without the need ofactually stapling or sewing the ends ofthese pockets to close them.

Other features and advantages of the invention will appear from thedetailed description and claims when taken with the drawings in which:

Fig. 1 is a fragmentary vertical section of a filter unit of the presentinvention;

Fig. 21s a plan view of a radial fin support with a replaceable filterelement telescoped thereon for use in the filter unit of Fig. 1; and

Fig. 3 discloses a modified form of the invention wherein retainingrings respectively engage the upper and lower edges of the inner flutesof a radial fin support, a construction which is desirable in filterunits of larger sizes.

Referring especially to Figs. 1 and 2, the numeral 5 designatesanannular bottom plate having its outer edge formed as a vertical flange 6and having its inner edge provided with an upwardly extending flange I,the out turned edge 8 of the flange I being spot-welded or otherwisesealed to the upper end of an outlet sleeve 9. This sleeve may beinternally threaded for connection to a discharge pipe. The annularflange I of the bottom plate is adapted to have telescoped thereon ahollow, cylindrical core III of perforated sheet metal. The lower edgeof this 'core is preferably welded or otherwise sealed to the annualflange I, while upper end ll of the core is closed except for a centralaperture therethrough. A bolt l2 extending through said central apertureand having its head secured to the inner surface of the top H, has abutterfly nut 13 threaded thereon. This bolt and nut serve to retain atop plate It in position on the filter unit, the top plate preferablyhaving the same diameter as the bottom plate 5. The top plate has adownwardly projectin peripheral flange l5 and is provided with adepressed central part comprising the annular flange is joined to a flatcircular portion H which has a diameter approximately equal to thediameter of the cylindrical core I. The recessed top plate It and thebottom plate 5 are adapted to retain a hollow radial fin support H3 inconcentric relation on core Ill. The radial fin support l8, which isfluted in cross section, and which is made of relatively coarse heavyscreen material, has snugly fitted thereover, a replaceable filterelementof similar fluted cross section. The replaceable filter elementcomprises a reinforcing layer 20 of screening which is preferably offiner mesh than that of the support and which can be made either ofmetal or plastic material. The surface of the rfinforcing layer iscovered with a filtering layer 2|, which may be fabric or felt-likematerial. This fabric covers the outer surface of the layer of finescreening 20 and extends over the edge to the inner surface thereof ateach end where a hem 22 is turned and stitched, as indicated at 23, tothe respective margins of the screening layer 20. It will be understoodthat the filter element comprising the fine screening layer 20 and thecovering fabric 2|, is made of relatively inexpensive material so thatwhen the filter element becomes fouled in service, it can be discardedand a new element substituted therefore. It should be pointed out thatin the present arrangement, it is unnecessary-to stitch the ends of theradial pockets or fins of the filter element as in prior devices sincethese pockets are sealed at their lower ends by an annular layer orwasher 24 of felt material and are likewise closed at their upper endsby a similar layer or washer 25 of 'felt material.

When it becomes necessary to replace a filter element, the butterfly nutI3 is unscrewed from the bolt l2. This permits the cover plate H and thefelt washer 24 to be disassembled from the core to. The support IS withthe filter element thereon is withdrawn from the core III. The usedlower felt washer 24 is removed from the bottom and a fresh felt washeris replaced thereon. The fouled filter element comprising the fabriclayer 2| and its reinforcing screen 20 is removed endwise from coarsescreen support l8. A fresh filter element is then replaced on theoutside of the support. The support It! with a fresh filter elementthereon is replaced on the core Ill with the-lower margin of the severalflutes embraced by the flange 6 of the bottom plate 5. It will beunderstood that the lower ends of the several flutes engage the freshfelt washer 24 which rests against the bottom plate 5. A fresh feltwasher 25 is placed within the cover plate It. This cover plate with itsfresh washer is then assembled on the filter element together with thesupport l8,

. 3 I in the position .shown in Fig. 1. Thereafter the butterfly nut I3is tightened on the bolt 12 ,to force the cover plate I! toward thebottom plate 5. This operation embeds the top and bottom edges of thefilter element in the felt washers 24, and 25 to prevent leakage ofunfiltered fluid through the filter unit. Thus, the fiuid to be filteredmust pass inward through the filter element where it is freed of foreignmatter, and then flows through the openings in the cylindrical core l0to be .discharged through the sleeve 9. I

In the modified form of the invention, shown in Fig. 3 the flutedsupport It of coarse screen material has the inner ends of itsfiutesmaintained in circular relation by rings 26, one ring engaging thebottom margin (not shown) of the support. Each ring 26 is provided withaseries of fingers 21 one of which is adapted to enter each flute, thefingers being then bent inward to grip the several flutes against theouter surface of the ring. The constructiongillustrated in Fig. 3insures a support of greater rigidity and is therefore particularlysuited for use in larger sizes of filter units.

Although preferred embodiments of the present invention have beendisclosed, it will be under stood that other modifications may be madewithin the spirit and scope of the appended claims.

What I claim is: i 1. A filter unit comprising a circular bottom plateprovided with an outlet, a circular top plate spaced from said bottomplate, each of said plates being lined with a fibrous sheet, a generallycylindrical radial fin support made of coarse rigid porous material andmounted with its ends respectively engaging said sheets, said supportbeing formed with flutes and being providedatits top and also at itsbottom with a reinforcing ring, each ring having fingers gripping therespective aaeaosa I material through which con! oil and the like willpass and being also formed of an inner layer of finer screen material,and means layer of fibrous for drawing said plates toward each other toengage threspective ends of said filter element.

2. A filter unit comprising a circular bottom" plate provided with anoutlet, 9. circular 'top plate spaced from said bottom plates beinglined with a; fibrous sheet, agenits ends respectively engaging saidsheets, a continuous radial fin filter element generaliycoex tensivewith said support and slidable longitudiflutes to aflord a rigidstructure, a radial fin filter element generally coextensive with saidsupport and telescoped thereover to engage the outside surface of saidsupport, said element being open at both of its ends and being formed ofan outer nally thereover to engage the outside surface of said support,said element being open at both of its ends and being formed of onelayer of unimpregnated fibrous material and being also formed of asecond layer of screen material readily conformable to said support, andmeans for drawing said plates toward each other whereby said sheetsengage the respective ends of said filter element.

CLAUDE F. HASSELWANDER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 231,066 Long Aug. 10, 18801,362,522 Biette Dec. 14, 1920 1,502,545 Bowes July 22, 1924 1,728,305Raney Sept. 17, 1929 1,898,027 Winslow Feb. 21, 1933 1,898,259 Orem Feb.21, 1933 1,983,100 Schulz Dec. 4, 1934 2,016,993 Dollinger Oct. 8, 19352,050,581 Orem Aug. 11, 1936 2,068,511 Raisch Jan. 19,- 1937 2,145,535Vokes Jan. 31, 1939 2,218,800 Williams Oct. 22, 1940 2,239,868 WilliamsApr. 29, 1941 2,239,950 Berg Apr. 29, 1941 2,279,423 Vokes Apr. 14, 19422,287,344 Easton et al. June 23, 1942' plate, each of said i supportmade-of

